The Zoo Med Nano Ceramic Heat Emitter fits standard ceramic light fixtures and the Zoo Med Nano Dome fixtures. Excellent choice when a 24 hour reptile heating element is needed for small enclosures for housing reptiles or amphibians. Great choice for crested geckos, gargoyle geckos, small lizards and other habitats that need a 5-10 degree boost in ambient temperatures. Using a reptile thermostat will help control consistent temperatures. Zoo Med's Nano Ceramic Heat Emitter does not emit any light and can last up to 5 years!